The following code gives different output when running the release inside Visual Studio, and running the release outside Visual Studio. I’m using Visual Studio 2008 and targeting .NET 3.5. I’ve also tried .NET 3.5 SP1. When running outside Visual Studio, the JIT should kick in. Either (a) there’s something subtle going on with C# that … Read more
I was benchmarking some code, and I could not get it to run as fast as with java.math.BigInteger, even when using the exact same algorithm. So I copied java.math.BigInteger source into my own package and tried this: //import java.math.BigInteger; public class MultiplyTest { public static void main(String[] args) { Random r = new Random(1); long … Read more
What does a JIT compiler specifically do as opposed to a non-JIT compiler? Can someone give a succinct and easy to understand description? 18 s 18 A JIT compiler runs after the program has started and compiles the code (usually bytecode or some kind of VM instructions) on the fly (or just-in-time, as it’s called) … Read more
I’ve been hearing a lot about the PyPy project. They claim it is 6.3 times faster than the CPython interpreter on their site. Whenever we talk about dynamic languages like Python, speed is one of the top issues. To solve this, they say PyPy is 6.3 times faster. The second issue is parallelism, the infamous … Read more
The following Java program takes on average between 0.50 secs and 0.55 secs to run: public static void main(String[] args) { long startTime = System.nanoTime(); int n = 0; for (int i = 0; i < 1000000000; i++) { n += 2 * (i * i); } System.out.println((double) (System.nanoTime() – startTime) / 1000000000 + ” … Read more
